Roy Harper on ProgArchives?

I think there's a good case for Pentangle being included in the archives. 'Jack Orion' is a side long epic off 'Cruel Sister', 'Light Flight' has enough tricky time changes to satisfy any prog fan, the four musicians were all masters of their instruments and they incorporated elements of mdieval music (Lyke Wake Dirge for example) jazz (Danny Thompson's wonderful bass playing, Light Flight) folk, blues etc.

For similar reasons, I'd suggest the early incarnation of Fairport Convention - tracks like 'A Sailors Life', 'Sloth' and just about everything off Liege and Lief sit very nicely in the progressive folk category. They even made a concept album, Babbacombe Lee (not very proggy though).

As for Roy Harper - great performer yes, prog no, even if he did sing 'Have A Cigar'.

But what about some of John Martyn's 70s output?

Syzygy wrote: For similar reasons, I'd suggest the early incarnation of Fairport Convention - tracks like 'A Sailors Life',

I tend to play that track as folk/psychedelia - and perhaps the one obvious link I can just about hear, when some diehards have called Fairport, England's Jefferson Airplane (by which I've had to  imply comparison with the pre-Grace Slick line-up???). BTW have you heard the alternative take on Richard Thompson's triple CD set Watching From The Dark (?) ?

About as close as you go is Harper's HQ. The HQ remastered CD (Science Friction Records) has the pictures of the Harper Hyde Park free show with John Paul Jones,  Dave Gilmour, and the Edgar Broughton Band's drummer in support. While the studio recording with Bruford and Chris Spedding (who was between Nucleus, The Sharks, and - amazingly - creating one of the best opening riffs for a British punk tune), provided the electric  rock (as opposed prog rock) and rock'n'roll backing for Harper.

In passing ,the Oregon-based Obscured By Clouds, well known for semi- unplugged covers of Floyd, can make that songbook sound distantly Harperish.